Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1991-10-25
1993-12-21
Chilcot, Jr., Richard E.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359152, 359143, H04B 1024
Patent
active
052725553
ABSTRACT:
A method and an apparatus for bidirectional optical transmission capable of bidirectional communication through a single optical transmission path are disclosed. A light traveling in one direction is modulated by a first base band signal and another light beam traveling in a second direction is modulated by a subcarrier signal which is modulated by a second base band signal for subsequent conversion into the binary digit pulse. A light receiving circuit for receiving the light traveling in said second direction is comprised of a synchronizing detection demodulator and at least a light receiver to which an electrical signal synchronizing to the subcarrier signal is applied.
REFERENCES:
patent: 5005212 (1991-04-01), Wood
Nicholson, "Use of a Fibre Loop Reflector as Downstream Receiver and Upstream Modulator in Passive Optical Network", Electronic Letters, vol. 26 No. 12, pp. 827-828, Jun. 7, 1990.
Petrovic, et al., "Bidirectional Digital Optical Fiber System with Transmitters Synchronized with Receivers", Journal of Optical Communications, vol. 8, No.2, Jun. 1987, pp. 67-69.
Chilcot Jr. Richard E.
NEC Corporation
Negash K.
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